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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 252 · 40 questions
TalentJR

How to do it in your head (Up and down): Find how far the number is from the nearest ten (the distance). Go that distance up and the same distance down, and multiply the two new numbers. Add the distance squared.

NameDateTime takenScore ___ / 40
  1. 1.53² =
  2. 2.95² =
  3. 3.78² =
  4. 4.56² =
  5. 5.33² =
  6. 6.82² =
  7. 7.63² =
  8. 8.45² =
  9. 9.84² =
  10. 10.68² =
  11. 11.87² =
  12. 12.75² =
  13. 13.65² =
  14. 14.55² =
  15. 15.37² =
  16. 16.48² =
  17. 17.51² =
  18. 18.74² =
  19. 19.61² =
  20. 20.88² =
  21. 21.58² =
  22. 22.49² =
  23. 23.35² =
  24. 24.77² =
  25. 25.66² =
  26. 26.91² =
  27. 27.76² =
  28. 28.69² =
  29. 29.94² =
  30. 30.41² =
  31. 31.67² =
  32. 32.99² =
  33. 33.72² =
  34. 34.85² =
  35. 35.31² =
  36. 36.89² =
  37. 37.71² =
  38. 38.46² =
  39. 39.86² =
  40. 40.62² =

Answer key

  1. 2809
  2. 9025
  3. 6084
  4. 3136
  5. 1089
  6. 6724
  7. 3969
  8. 2025
  9. 7056
  10. 4624
  11. 7569
  12. 5625
  13. 4225
  14. 3025
  15. 1369
  16. 2304
  17. 2601
  18. 5476
  19. 3721
  20. 7744
  21. 3364
  22. 2401
  23. 1225
  24. 5929
  25. 4356
  26. 8281
  27. 5776
  28. 4761
  29. 8836
  30. 1681
  31. 4489
  32. 9801
  33. 5184
  34. 7225
  35. 961
  36. 7921
  37. 5041
  38. 2116
  39. 7396
  40. 3844

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